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thermal/int340x_thermal: Export GDDV

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Implementing DPTF properly requires making use of firmware-provided
information associated with the INT3400 device. Calling GDDV provides a
buffer of information which userland can then interpret to determine
appropriate DPTF policy.

Conflicts:
	drivers/thermal/intel/int340x_thermal/int3400_thermal.c

Signed-off-by: Matthew Garrett <mjg59@google.com>
Tested-by: Pandruvada, Srinivas <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Link: https://lore.kernel.org/r/20200414020953.255364-1-matthewgarrett@google.com
This commit is contained in:
Matthew Garrett 2020-04-13 19:09:51 -07:00 committed by Daniel Lezcano
parent 47fa116e5f
commit 0ba13c763a
1 changed files with 60 additions and 0 deletions
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60
drivers/thermal/intel/int340x_thermal/int3400_thermal.c
View File

@ -52,6 +52,25 @@ struct int3400_thermal_priv {
u8 uuid_bitmap;
int rel_misc_dev_res;
int current_uuid_index;
char *data_vault;
};
static ssize_t data_vault_read(struct file *file, struct kobject *kobj,
struct bin_attribute *attr, char *buf, loff_t off, size_t count)
{
memcpy(buf, attr->private + off, count);
return count;
}
static BIN_ATTR_RO(data_vault, 0);
static struct bin_attribute *data_attributes[] = {
&bin_attr_data_vault,
NULL,
};
static const struct attribute_group data_attribute_group = {
.bin_attrs = data_attributes,
};
static ssize_t available_uuids_show(struct device *dev,
@ -280,6 +299,32 @@ static struct thermal_zone_params int3400_thermal_params = {
.no_hwmon = true,
};
static void int3400_setup_gddv(struct int3400_thermal_priv *priv)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
status = acpi_evaluate_object(priv->adev->handle, "GDDV", NULL,
&buffer);
if (ACPI_FAILURE(status) || !buffer.length)
return;
obj = buffer.pointer;
if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count != 1
|| obj->package.elements[0].type != ACPI_TYPE_BUFFER) {
kfree(buffer.pointer);
return;
}
priv->data_vault = kmemdup(obj->package.elements[0].buffer.pointer,
obj->package.elements[0].buffer.length,
GFP_KERNEL);
bin_attr_data_vault.private = priv->data_vault;
bin_attr_data_vault.size = obj->package.elements[0].buffer.length;
kfree(buffer.pointer);
}
static int int3400_thermal_probe(struct platform_device *pdev)
{
struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
@ -311,6 +356,8 @@ static int int3400_thermal_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, priv);
int3400_setup_gddv(priv);
priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
priv, &int3400_thermal_ops,
&int3400_thermal_params, 0, 0);
@ -326,6 +373,13 @@ static int int3400_thermal_probe(struct platform_device *pdev)
if (result)
goto free_rel_misc;
if (priv->data_vault) {
result = sysfs_create_group(&pdev->dev.kobj,
&data_attribute_group);
if (result)
goto free_uuid;
}
result = acpi_install_notify_handler(
priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
(void *)priv);
@ -335,6 +389,9 @@ static int int3400_thermal_probe(struct platform_device *pdev)
return 0;
free_sysfs:
if (priv->data_vault)
sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group);
free_uuid:
sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
free_rel_misc:
if (!priv->rel_misc_dev_res)
@ -359,8 +416,11 @@ static int int3400_thermal_remove(struct platform_device *pdev)
if (!priv->rel_misc_dev_res)
acpi_thermal_rel_misc_device_remove(priv->adev->handle);
if (priv->data_vault)
sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group);
sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
thermal_zone_device_unregister(priv->thermal);
kfree(priv->data_vault);
kfree(priv->trts);
kfree(priv->arts);
kfree(priv);